Service Manual

These roles define the relationships between all devices so that each device can monitor the layers under its responsibility.
Maintenance points drop all lower-level frames and forward all higher-level frames.
Figure 4. Maintenance Points
Maintenance End Points
A maintenance end point (MEP) is a logical entity that marks the end point of a domain.
There are two types of MEPs defined in 802.1ag for an 802.1 bridge:
• Up-MEP — monitors the forwarding path internal to a bridge on the customer or provider edge. On Dell Networking
systems, the internal forwarding path is effectively the switch fabric and forwarding engine.
• Down-MEP — monitors the forwarding path external another bridge.
Configure Up-MEPs on ingress ports, ports that send traffic towards the bridge relay. Configure Down-MEPs on egress ports,
ports that send traffic away from the bridge relay.
Figure 5. Maintenance End Points
802.1ag 86